JP3935145B2 - Monitoring control device and monitored control device - Google Patents

Description

  The present invention relates to a monitoring control device and a monitored control device that use an auxiliary channel used in a broadcast wave in terrestrial digital broadcasting.

Conventionally, monitoring and control of a relay station broadcast station that relays a broadcast wave (radio wave) output from a master station broadcast station and supplies it to a general household, etc., is performed by using the broadcast wave or a communication line. An apparatus is used (see, for example, Non-Patent Document 1 and Non-Patent Document 2).
The monitoring and control apparatus using a broadcast wave modulates an audio carrier (carrier wave carrying an audio signal) included in the broadcast wave, puts monitoring information on the modulated audio carrier, and superimposes it on the broadcast wave. Accordingly, the monitored control device (relay device) of the relay station broadcast station arranged in the broadcast area extracts the monitoring information from the broadcast wave.

  A monitoring control device using a communication line uses a telephone line of a fixed telephone or a telephone line of a mobile phone, and sends monitoring information to these telephone lines, so that a monitored control device (relaying device) of a relay station broadcasting station is used. ) Is monitored and controlled (see, for example, Patent Document 1). As a matter of course, a monitoring and control apparatus using a communication line incurs a line cost (communication cost, running cost).

  Also, there is an analog relay device (analog relay device) that receives an analog wave (NTSC wave) output from the master station broadcasting station, converts the frequency of the analog wave, and retransmits. If the level of the reception wave received by the analog relay device and the level of the transmission wave transmitted from the analog relay device are monitored, squelch detection and output level detection are possible.

The squelch detection is to detect whether a broadcast wave output from the master station broadcast is propagated by a device called a squelch detection device at a relay station broadcast station.
FIG. 14 shows a conventional squelch detection device. The squelch detection apparatus 101 shown in FIG. 14 includes a detection circuit 103 that detects a received wave from a master station that has received a broadcast wave output from a master station broadcast station, a level of a detected signal, and a preset set value level. Are compared with each other, and a level comparison circuit 105 and an on / off control circuit 107 for controlling on / off of the relay device provided in the relay station broadcasting station.

  That is, this squelch detection device automatically turns on a relay device when a broadcast wave output from the master station is detected, and emits (relays) a broadcast wave from the relay device. However, if the broadcast wave output from the master station broadcast is no longer detected, it is assumed that the broadcast wave output from the master station broadcast has ended (broadcast ends), and the relay device is automatically turned off (OFF). ). This prevents unnecessary broadcast waves from being emitted, so that the squelch detection device is an indispensable device for the relay device at the relay station broadcasting station.

  Also, when receiving a conventional analog wave (NTSC wave), the received wave has a relatively high level carrier (audio carrier, video carrier [carrier wave carrying video]), so the reception input level is Since it is large, the squelch detection function can be ensured only by level detection for detecting the level of the received wave. Normally, in the relay device provided in the relay station broadcast station, if the reception input level is lowered by -20 to -25 dB from the standard level, it is determined that there is no broadcast wave from the master station broadcast station, and The broadcast wave emission (relay) is set to be automatically turned off (OFF).

  Because the conventional analog wave (NTSC wave) is a negative modulation wave, the peak of the modulated wave has a synchronous peak value, and does not change depending on the modulation content. By detecting this synchronous peak value, It is easy to detect the level of the received wave.

  Furthermore, when receiving a conventional analog wave (NTSC wave), in order to prevent noise emission of the analog wave, when there is no synchronization signal that should be originally included in the analog wave, the relay station relay station Control that does not turn on the device is also performed.

  By the way, devices (systems) other than the monitoring and control device using a communication line are based on the current analog wave (analog broadcasting system), and all data such as video and audio are digitized to form a single TS (transport). It is not possible to use the digital wave (digital broadcasting system) as it is after being converted into a stream) and transmitted through OFDM modulation (Orthogonal Frequency Division Multiplexing: a multi-carrier digital modulation system using multiple carriers).

  Incidentally, since the conventional digital wave (OFDM wave) is composed of a large number of carriers with respect to the conventional analog wave (NTSC wave), when viewed on the time axis, it has a noise-like waveform as shown in FIG. In addition, the average level is considerably lower than that of a conventional analog wave (NTSC wave) (−25 to −30 dB as compared with an analog wave), and a peak value that is higher by a few ten dB is occasionally generated.

  In the current analog broadcasting system, control other than squelch detection of the monitored control device (relay device) includes (1) media confirmation / program switching control using a program transmission signal, and (2) broadcast extension control (to relay device). (3) Multi-access control used in broadcasting satellites.

  (1) Media confirmation / program switching control using a program transmission signal is a signal (usually called an I signal or Q signal) that cannot be detected by a receiver provided in a general home or the like that receives broadcast waves. Program), and the monitored control device (relay device) detects the frequency of the signal, thereby confirming the media and switching the program between the net program (series program) and the local program. . When an undetectable signal is inserted into a program (program), when the program (program) is a video, it is in a vertical blanking period, and when the program (program) is audio, it is sent to a general household or the like. It is inserted in the 9 kHz band that cannot be detected by the receiver provided.

  (2) Broadcast extension control cannot be detected by inserting a signal that cannot be detected (difficult to detect) into a program (program) by a receiver provided in a general household, as in the media confirmation / program switching control. The transmitter included in the monitored control device (relay device) is activated after hours by the combination of signal frequencies (for example, 4 waves in the 9 kHz band) when the program (program) is extended.

(3) Multi-access control is provided for ordinary homes and the like by switching the station that is sending broadcast waves to the broadcasting satellite in the rain, etc., and stabilizing the program (program) reception state. This is done when delivering (propagating) to the machine. This multi-access control is performed by transmitting an end warning signal (usually called a Qc signal, which is the same as the program transmission signal in (1)) from the current station to the broadcasting satellite, and after a certain time has elapsed, Turn off the transmitter. The transmitting station that transmits the broadcast wave next receives the Qc signal, and after the time considering the propagation time to the broadcast satellite has elapsed, the transmitter is turned on smoothly by turning on the transmitter. The broadcast wave to be propagated to a general home is switched.
All pages of Broadcast Technology Sosho (Operational Technology), edited by Japan Broadcasting Corporation, Japan Broadcasting Publishing Association, published in December 1982 All pages of Broadcast Technology Sosho (Broadcast Satellite Technology), edited by Japan Broadcasting Corporation, Japan Broadcasting Publishing Association, published in December 1982

  However, in the conventional monitoring and control apparatus using the broadcast wave (analog wave [NTSC wave]), the voice carrier can carry only limited information, and only transmits the monitoring information. There is a problem that the relay device cannot be controlled. Also, with conventional monitoring and control devices that use communication lines, it is necessary to secure communication lines, and they are used in places where fixed line telephone lines cannot be laid, or in relay station broadcast stations located outside the mobile phone call area. There is a problem that you can not.

  In addition, since the conventional digital wave (OFDM wave) has a lower average level than the analog wave (NTSC wave) and does not include characteristics such as a synchronization signal, the conventional digital wave (OFDM wave) was used. In the monitoring and control device, the relay device at the relay station broadcaster misidentifies other external noise components and digital waves (OFDM waves) from other stations as those output from the master station, and emits noise and different programs (different types of Program).

  Furthermore, conventional (1) media confirmation / program switching control using program transmission signals, (2) broadcast extension control (starting up of transmitter included in relay device), (3) used in broadcasting satellite Multi-access control, which presupposes the current analog broadcasting system, has a problem that it cannot be used as it is in the digital broadcasting system.

  Therefore, in the present invention, the above-described problem is solved, and it is deployed in a relay station broadcast station without using a communication line and without misidentifying other external noise components and digital waves (OFDM waves) of other stations. It is an object of the present invention to provide a monitoring control device and a monitored control device that can perform monitoring and control of a relay device in the same manner as a conventional analog broadcasting system.

To solve the above problems, monitoring and control device according to claim 1, wherein the auxiliary channel in terrestrial digital broadcasting, media identification signals identifying the release transmitting belongs source, the master station to be controlled by the broadcast wave One of the media identification signal and the broadcast station identification ID signal detected at the master station broadcast station or the relay station broadcast station by superimposing and transmitting a broadcast station identification ID signal for identifying the broadcast station or the relay station broadcast station Is a monitoring control device capable of outputting an alarm signal and a squelch control signal or a standby system switching control signal when the signal does not match a preset signal, comprising: an identification signal generating means; a TS signal sending means; The signal superimposing means, the OFDM modulation means, and the output means are provided.

  According to such a configuration, the supervisory control device generates the media identification signal and the broadcast station identification ID signal by the identification signal generating means. That is, the identification signal generating means can identify a broadcast wave of a broadcasting station, for example, a broadcast wave of a general TV of the Japan Broadcasting Corporation, a broadcast wave of an educational TV of the Japan Broadcasting Corporation, and the broadcast. A broadcast station identification ID signal that can identify a broadcast station that emits (transmits) a wave (for example, a broadcast station in Tokyo or a broadcast station in Osaka) is generated. Subsequently, this supervisory control device sends out a TS signal of a broadcast wave of digital terrestrial broadcasting by a TS signal sending means. This TS signal is a transport stream (TS) defined by one transport stream (TS) defined by MPEG-2 or a re-multiplex of a plurality of transport streams (TS). It is.

  Then, the monitoring control apparatus is configured such that the signal superimposing means sets the media identification signal generated by the identification signal generating means, the broadcasting station identification ID signal to the auxiliary channel preset by the TS signal sent by the TS signal sending means. Is superimposed (stored). This auxiliary channel (Auxiliary Channel AC) is a signal for transmitting additional information in terrestrial digital broadcasting. In this supervisory control apparatus, the OFDM modulation means performs OFDM modulation on the signal superimposed TS signal in which the media identification signal and the broadcast station identification ID signal are superimposed on the auxiliary channel by the signal superimposing means. In the monitoring control apparatus, the output unit outputs an OFDM signal obtained by performing OFDM modulation on the signal superimposed TS signal by the OFDM modulation unit, as a broadcast wave of digital terrestrial broadcasting. For reference, OFDM modulation is a type of multi-carrier digital modulation method that uses a large number of carrier waves.

  In other words, this supervisory control device transmits an ID signal (media identification signal) indicating its own station using the AC included in the digital broadcast wave, and is received by the monitored control device (relay device) of the relay broadcast station. Thereafter, after demodulating the received digital broadcast wave (received wave), it is determined whether or not the received wave belongs to the own station. If the received wave is other than its own station, the monitored control device (relay device) shuts down the transmitter included in the device and sends a display and an alarm signal. Incidentally, the current analog broadcasting system only detects the level of the synchronization signal of the received wave, and does not have a function for identifying such media.

  Further, after being received by the monitored control device (relay device) of the relay broadcast station, when the received digital broadcast wave (received wave) is retransmitted, it is included in the monitored control device (relay device). By demodulating the output of the transmitter (transmitter output) and detecting the ID signal (media identification signal), it is determined whether or not the output of the monitoring control device (relay device) is normal Become. If the ID signal (media identification signal) is not detected, the monitored control device (relay device) outputs a display and an alarm signal and outputs a signal for switching to the standby system. Incidentally, the current analog broadcasting system only detects the level of the synchronization signal of the received wave, and does not have a function of detecting the output of such a monitored control device (relay device).

The monitoring control device according to claim 2 is provided with a media identification signal for identifying a broadcast wave affiliation source, and a broadcast station identification ID signal for identifying a master station broadcast station or a relay station broadcast station to be controlled by the broadcast wave. the auxiliary channel in the digital terrestrial broadcasting with a TS signal is displayed by the program, by transmitting superimposes a control signal for controlling the broadcasting device provided in the master station broadcasting stations or relay stations broadcasting stations, the master station broadcasting stations or relay When any one of the media identification signal and the broadcast station identification ID signal detected from the program at a station broadcasting station does not match a preset signal, an alarm signal and a squelch control signal can be output. If even match, a monitoring control device that enables control based on the control signal, a control signal input means, TS And No. delivery means, and a signal superposition unit, an OFDM modulation unit, an output unit, configured to include a.

  According to such a configuration, the control signal is input to the monitoring control device by the control signal input means. This control signal controls a broadcasting device (output device, relay device) provided in the master station broadcasting station or the relay station broadcasting station, and starts and stops the device, to a spare machine (preliminary system) prepared in advance. Is switched. Subsequently, this supervisory control device sends out a TS signal of a broadcast wave of digital terrestrial broadcasting by a TS signal sending means. In the monitoring control apparatus, the signal superimposing unit superimposes (stores) the control signal input by the control signal input unit on the auxiliary channel preset by the TS signal transmitted by the TS signal transmission unit. In this supervisory control device, the OFDM modulation means performs OFDM modulation on the signal superimposed TS signal in which the control signal is superimposed on the auxiliary channel by the signal superimposing means. In this monitoring and control apparatus, the output means outputs an OFDM signal obtained by subjecting the signal superimposed TS signal to OFDM modulation by the OFDM modulation means as a broadcast wave of digital terrestrial broadcasting.

Monitor control apparatus according to the third aspect, the auxiliary channel in terrestrial digital broadcasting, media identification signals identifying the release transmitting belongs source, the master station broadcasting stations or relay stations broadcast stations to be controlled by the broadcast wave Is detected at the master station broadcast station or the relay station broadcast station by superimposing and transmitting the broadcast station identification ID signal for identifying the broadcast station and the control signal for controlling the broadcasting device provided in the master station broadcast station or the relay station broadcast station. When either the media identification signal or the broadcast station identification ID signal does not match a preset signal, the alarm signal and the standby system switching control signal can be output, and when both match, a supervisory control device that enables control based on the control signal, the identification signal generating unit, and a control signal input means, a TS signal sending means, a signal superimposing means And OFDM modulation means and an output means, configured to include a.

  According to such a configuration, the monitoring control device generates the media identification signal and the broadcast station identification ID signal by the identification signal generation unit, and the control signal is input by the control signal input unit. Subsequently, this supervisory control device sends out a TS signal of a broadcast wave of digital terrestrial broadcasting by a TS signal sending means. Then, the monitoring control apparatus is configured such that the signal superimposing means sets the media identification signal generated by the identification signal generating means, the broadcasting station identification ID signal to the auxiliary channel preset by the TS signal sent by the TS signal sending means. The control signal input by the control signal input means is superimposed (stored), and the signal superimposed TS signal on which these signals are superimposed is subjected to OFDM modulation by the OFDM modulation means. In this monitoring and control apparatus, the output means outputs an OFDM signal obtained by subjecting the signal superimposed TS signal to OFDM modulation by the OFDM modulation means as a broadcast wave of digital terrestrial broadcasting.

  That is, in this monitoring and control apparatus, the control signal for controlling the monitored control apparatus (relay apparatus) and the ID signal (broadcast station identification ID signal) indicating the control target station are transmitted using the AC included in the digital broadcast wave. Then, after being received by the monitored control device (relay device) of the relay broadcast station, the monitored control device (relay device) is controlled after demodulating the received digital broadcast wave (received wave). Become. Since this ID signal (broadcast station identification ID signal) is assigned to the monitored control device (relay device) of each relay broadcast station, the monitored control device (relay device) of each relay broadcast station is controlled separately. It is also possible. By the way, in the current analog broadcasting system, the monitored control devices (relay devices) of each relay broadcast station do not have an ID signal (broadcast station identification ID signal), so all relay broadcast stations can only be controlled simultaneously. Can not.

  5. The monitored control apparatus according to claim 4, wherein at least a media identification signal for identifying a broadcast wave affiliation source superimposed on an auxiliary channel in terrestrial digital broadcasting, and a master station broadcasting station to be controlled by the broadcast wave Or a monitored control device that is monitored and controlled by a broadcast station identification ID signal for identifying a relay station broadcast station, wherein distribution means, reception means, auxiliary channel demodulation means, identification signal detection means, and transmission means; It was set as the structure provided with.

  According to such a configuration, the monitored control apparatus distributes the OFDM signal, which is a broadcast wave of terrestrial digital broadcasting, by the distributing unit, and receives the distributed OFDM signal by the receiving unit. In other words, this distribution means distributes broadcast waves acquired by an antenna or the like to a few systems, and the reception means performs conversion processing (detection, amplification, etc.) on the distributed OFDM signals. is there. Subsequently, the monitored control device demodulates the auxiliary channel included in the signal superimposed TS signal obtained by OFDM demodulating the OFDM signal by the auxiliary channel demodulating unit, and the media identification signal, the broadcasting station by the identification signal detecting unit. Identification ID signals are detected, and it is determined whether or not they match a preset signal. If they do not match, for example, the media identification signal and the broadcast station identification ID signal do not match those of the own station (broadcast wave) In the case other than the local wave), an alarm signal and a squelch control signal that stops (shuts down) the function of the device are output (so-called squelch function).

  The monitored control apparatus transmits the OFDM signal received by the receiving means when the transmitting means does not output the squelch control signal by the identification signal detecting means. That is, the broadcast wave (OFDM signal) received by the receiving means is relayed and output.

  6. The monitored control device according to claim 5, wherein at least a media identification signal for identifying a broadcast wave belonging source superimposed on an auxiliary channel in terrestrial digital broadcasting, and a master station broadcasting station to be controlled by the broadcast wave Or a monitored control device that is monitored and controlled by a broadcast station identification ID signal that identifies a relay station broadcast station, wherein the reception means, the transmission means, the distribution means, the auxiliary channel demodulation means, and the identification signal detection means It was set as the structure provided with.

  According to such a configuration, the monitored control device receives the OFDM signal that is a broadcast wave of digital terrestrial broadcasting by the receiving unit, and according to the presence or absence of the standby system switching control signal by the transmitting unit, that is, the standby system switching control signal. If there is no signal, an OFDM signal that is the broadcast wave is transmitted. This backup system switching control signal is output when the media identification signal and the broadcast station identification ID signal detected from the auxiliary channel do not match the preset signal.

  Subsequently, the monitored control apparatus distributes the OFDM signal transmitted by the transmitting means by the distributing means, and the auxiliary channel included in the signal superimposed TS signal obtained by OFDM demodulating the OFDM signal by the auxiliary channel demodulating means. Is demodulated. The monitored control device detects the media identification signal and the broadcast station identification ID signal from the auxiliary channel demodulated by the auxiliary channel demodulation unit by the identification signal detection unit, and these do not match the preset signal. In addition, an alarm signal is output and a standby system switching control signal is output. In other words, this monitored control device has a so-called output detection function for detecting a broadcast wave (OFDM signal) output from the transmission means.

  7. The monitored control device according to claim 6, wherein at least a media identification signal for identifying a broadcast wave affiliation source superimposed on an auxiliary channel in terrestrial digital broadcasting, and a master station broadcasting station to be controlled by the broadcast wave Or a monitored control device that is monitored and controlled by a broadcast station identification ID signal that identifies a relay station broadcast station, the first distribution means, the reception means, the first auxiliary channel demodulation means, the transmission means, Two distribution means, second auxiliary channel demodulation means, and identification signal detection means are provided.

  According to such a configuration, the monitored control apparatus distributes the OFDM signal, which is a broadcast wave of terrestrial digital broadcasting, by the first distribution unit, and receives the OFDM signal distributed by the first distribution unit by the reception unit. Subsequently, the monitored control device demodulates the auxiliary channel included in the signal superimposed TS signal obtained by OFDM demodulating the OFDM signal by the first auxiliary channel demodulating unit, and transmits the standby system switching control signal by the transmitting unit. The broadcast wave (OFDM signal) is transmitted according to the presence or absence, that is, when there is no standby system switching control signal.

The monitored control apparatus distributes the OFDM signal transmitted by the transmitting means by the second distributing means, and the signal superposition TS obtained by OFDM demodulating the distributed OFDM signal by the second auxiliary channel demodulating means. Demodulate the auxiliary channel included in the signal, and detect the media identification signal and the broadcast station identification ID signal from at least one of the demodulated auxiliary channels by the identification signal detection means, and determine whether or not it matches the preset signal, When the media identification signals do not match or when the broadcast station identification ID signals do not match, an alarm signal is output and a standby system switching control signal is output.

  8. The monitored control device according to claim 7, wherein at least a media identification signal for identifying an affiliation source of a broadcast wave multiplexed on an auxiliary channel in terrestrial digital broadcasting, and a master station broadcasting station to be controlled by the broadcast wave Or a monitored control apparatus to be monitored and controlled by a broadcast station identification ID signal for identifying a relay station broadcast station and a control signal for controlling the broadcast apparatus provided in the master station broadcast station or the relay station broadcast station. Means, receiving means, auxiliary channel demodulating means, identification signal detecting means, and transmitting means.

According to such a configuration, the monitored control apparatus distributes the OFDM signal that is a broadcast wave of digital terrestrial broadcasting by the distributing unit, and receives the OFDM signal distributed by the distributing unit by the receiving unit. Subsequently, the monitored control device demodulates the auxiliary channel included in the signal superimposed TS signal obtained by OFDM demodulation of the OFDM signal by the auxiliary channel demodulating unit, and demodulates by the auxiliary channel demodulating unit by the identification signal detecting unit. The medium identification signal, the broadcast station identification ID signal, and the control signal are detected from the auxiliary channel input from the auxiliary channel and the auxiliary channel that is different from the monitored control apparatus, and the media identification signal and the broadcast station identification ID signal are detected. If the media identification signal does not match, or the broadcast station identification ID signal does not match, an alarm signal for notifying abnormality detection, a control signal, and a prepared signal are prepared in advance. And a standby system switching control signal for performing control to switch to the spare apparatus. Thereafter, the monitored control device transmits the broadcast wave (OFDM signal) received by the receiving unit based on the control signal output from the identification signal detecting unit and the standby system switching control signal by the transmitting unit.

  The monitored control device according to claim 8 controls at least a broadcasting device provided in a master station broadcasting station or relay station broadcasting station that is multiplexed on an auxiliary channel in terrestrial digital broadcasting and is controlled by a broadcast wave. A monitored control apparatus that is monitored and controlled by a control signal, comprising a distribution means, a reception means, an auxiliary channel demodulation means, an OFDM demodulation means, an identification signal detection means, and a transmission means. .

  According to such a configuration, the monitored control apparatus distributes the OFDM signal that is a broadcast wave of digital terrestrial broadcasting by the distributing unit, and receives the OFDM signal distributed by the distributing unit by the receiving unit. Subsequently, the monitored control device demodulates the auxiliary channel included in the signal superimposed TS signal obtained by OFDM demodulating the OFDM signal by the auxiliary channel demodulating unit, and OFDM demodulates the OFDM signal by the OFDM demodulating unit. Then, a signal superimposed TS signal is obtained. The monitored control device detects the control signal from the auxiliary channel demodulated by the auxiliary channel demodulation unit by the identification signal detection unit, and is included in the signal superimposed TS signal demodulated by the OFDM demodulation unit. , A media identification signal for identifying the affiliation source of the broadcast wave, a broadcast station identification ID signal for identifying a master station broadcast station or a relay station broadcast station to be controlled by the broadcast wave, and the media identification signal It is determined whether at least one of the broadcast station identification ID signal matches a preset signal, and if not, an alarm signal for notifying abnormality detection and a squelch control signal for stopping the function of the device are output. . Thereafter, this monitored control apparatus transmits the broadcast wave (OFDM signal) received by the receiving means when the transmitting means does not output the squelch control signal by the identification signal detecting means.

  According to the first, second, and third aspects of the present invention, in the broadcast wave of terrestrial digital broadcasting, the media identification signal, the broadcasting station identification ID signal, and the control signal are output using the auxiliary channel effectively. Without using a line, without misidentifying other external noise components and digital waves (OFDM waves) of other stations, not only monitoring relay devices (monitored control devices) deployed at relay station broadcast stations, Control can also be performed.

  According to the inventions of claims 4, 5, 6, 7, and 8, in the broadcast wave of terrestrial digital broadcasting, the media identification signal, the broadcast station identification ID signal, and the control signal are output by effectively using the auxiliary channel. Therefore, without using a communication line, without misidentifying other external noise components and digital waves (OFDM waves) of other stations, these signals can be used for monitoring as well as monitoring from the transmitting side. .

Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
In the description of the best mode, first, the configuration and operation of five embodiments (first embodiment to fifth embodiment) of a monitoring control system including a monitoring control device and a monitored control device will be described. Then, the relationship between the control level and the relay device (monitored control device) at the relay station broadcast station will be described, and an example of using the auxiliary channel will be described.

(Configuration of monitoring control system [first embodiment])
FIG. 1 shows a block diagram of a first embodiment of the supervisory control system. As shown in FIG. 1, the monitoring control system A includes a monitoring control device 1A and a monitored control device 3A. This supervisory control system A uses the auxiliary channel included in the broadcast wave of the digital terrestrial broadcast transmitted from the supervisory control device 1A arranged at the master station broadcast station, and is monitored at the relay station broadcast station. It monitors and controls the control device 3A. The broadcast wave (broadcast system) of terrestrial digital broadcasting is a transmission band composed of 13 OFDM segments. Incidentally, the OFDM segment refers to a signal composed of a basic band and a frame in which a control signal carrier (carrier wave carrying a control signal) is added to a data carrier (carrier wave carrying data).

[Configuration of Monitoring and Control Device 1A]
The monitoring control device 1A performs squelch control of the monitored control device 3A using an auxiliary channel included in the broadcast wave of terrestrial digital broadcasting. The monitoring control device 1A includes an identification signal generating means 5, a TS signal sending means 7, Superposition means 9, OFDM modulation means 11, and output means 13 are provided.

  The identification signal generating means 5 generates a media identification signal and a broadcast station identification ID signal indicating the affiliation source of the broadcast wave. The media identification signal is a signal having a specific pattern for identifying a broadcast wave of a broadcasting station. Examples thereof include a signal having a specific pattern for identifying a general TV in Tokyo and a signal having a specific pattern for identifying an educational TV in Tokyo. The broadcast station identification ID signal is a signal with a specific pattern for identifying a master station broadcast station or a relay station broadcast station that has output a broadcast wave (radio wave), for example, a signal with a specific pattern for identifying a master station broadcast station in Tokyo. , A specific pattern signal for identifying a relay station broadcasting station in Nagoya.

  The TS signal sending means 7 sends a TS signal (Transport Stream) of a broadcast wave of terrestrial digital broadcasting. This TS signal is defined by MPEG-2, and is subjected to transmission path coding according to the service provided to the viewer terminal directly from the master station broadcast station or via the relay station broadcast station. Is.

  The signal superimposing means 9 superimposes the media identification signal and broadcasting station identification ID signal generated by the identification signal generating means 5 on the auxiliary channel set in advance in the TS signal transmitted by the TS signal transmitting means 7. is there. That is, the signal superimposing means 9 inserts the media identification signal and the broadcast station identification ID signal as the additional information into the auxiliary channel for transmitting the additional information. A device that realizes the function of the signal superimposing means 9 is called an AC inserter.

  The auxiliary channel (Auxiliary Channel: AC) is an additional information transmission path (an extension signal for transmitting additional information) related to transmission control of modulated waves (terrestrial digital broadcast waves). The auxiliary channel additional information is transmitted by performing DBPSK (Differential Binary Phase Shift Keying) modulation on a pilot carrier of the same type as that of a continuous pilot (CP). Incidentally, the continuous pilot refers to a continuous carrier.

  Further, the auxiliary channel has a PRBS (Pseudo-Random Binary Sequence) generation circuit (not shown) in which a differential reference is arranged at the head symbol of the frame constituting the auxiliary channel and is incorporated in the TS signal transmission means 7. The number of signal points corresponding to the output bit string Wi.

  The OFDM modulation means 11 performs OFDM modulation on the signal superimposed TS signal in which the media identification signal and the broadcast station identification ID signal are superimposed on the auxiliary channel of the TS signal by the signal superimposing means 9 to obtain an OFDM signal. This OFDM modulation means 11 performs, in accordance with the ISDB-T system, hierarchical parallel processing such as error correction, modulation, interleaving, TMCC (Transmission and Multiplexing Configuration Control) signal generation, frame configuration, etc. on the signal superimposed TS signal, and then IFFT ( Transmission path coding is performed by applying an inverse Fourier transform.

  By the way, ISDB-T (Integrated Services Digital Broadcasting for Terrestrial Television Broadcasting) system is equipped with time interleaving and enables powerful transmission path coding for mobile reception where fluctuations in the received electric field are inevitable. .

  The transmission spectrum of the OFDM signal is composed of 13 consecutive OFDM blocks (hereinafter referred to as OFDM segments) obtained by dividing the channel bandwidth of television broadcasting into 14 equal parts. In this OFDM modulation means 11, the transmission structure of the OFDM signal is realized in the unit of the segment width of the OFDM segment by structuring the carrier configuration of the OFDM segment so that a plurality of the OFDM segments can be connected. .

  The output means 13 uses the OFDM signal obtained by OFDM-modulating the signal superposition TS signal by the OFDM modulation means 11 as a broadcast wave of terrestrial digital broadcasting and directs it to a plurality of monitored control devices 3A provided in each relay station broadcasting station. Output (send).

  According to this monitoring control apparatus 1A, the identification signal generating means 5 generates a media identification signal and a broadcast station identification ID signal, and the TS signal transmitting means 7 transmits a TS signal of a broadcast wave of terrestrial digital broadcasting. The signal superimposing means 9 superimposes the media identification signal and broadcast station identification ID signal generated by the identification signal generating means 5 on the auxiliary channel preset by the TS signal sent by the TS signal sending means 7 ( Stored) to obtain a signal superimposed TS signal, and OFDM modulation means 11 applies OFDM modulation to the signal superimposed TS signal. Thereafter, the output means 13 outputs an OFDM signal obtained by subjecting the signal superimposed TS signal to OFDM modulation by the OFDM modulation means 11 as a broadcast wave of terrestrial digital broadcasting.

  For this reason, in the broadcast wave of digital terrestrial broadcasting, the auxiliary channel is effectively used to output the media identification signal and the broadcast station identification ID signal. Therefore, the monitored control device 3A on the receiving side receives the media identification signal, Based on the broadcast station identification ID signal, the affiliation source and control target of the received OFDM signal are determined, and other external noise components and digital waves (OFDM signals) of other stations can be obtained without using a communication line. Without misunderstanding, not only the monitoring of the apparatus 3A but also control can be performed.

[Configuration of Monitored Control Device 3A]
The monitored control device 3A is arranged at the relay station broadcasting station and is monitored and controlled by the monitoring control device 1A on the transmission side. The distribution means 15, the receiving means 17, the auxiliary channel demodulation means 19, and the identification A signal detection unit 21 and a transmission unit 23 are provided.

  The distribution means 15 captures an OFDM signal transmitted as a broadcast wave of terrestrial digital broadcast from the monitoring control apparatus 1A with an antenna or the like, and distributes the captured OFDM signal to a plurality of systems (usually a few systems). Is. The OFDM signal distributed by the distribution unit 15 is input to the reception unit 17 and the auxiliary channel demodulation unit 19.

  The receiving unit 17 receives the OFDM signal distributed by the distributing unit 15 and performs conversion processing. This conversion process includes a detection process for detecting an OFDM signal, an amplification process for amplifying the transmission spectrum of the OFDM signal detected by the detection process, and an amplification process at a place where SFN (Single Frequency Network) is performed. This refers to a synchronization process or the like for synchronizing the monitored OFDM signals amplified in step 3A between the monitored control devices 3A.

  The auxiliary channel demodulation means 19 demodulates the auxiliary channel included in the signal superimposed TS signal obtained by demodulating the OFDM signal distributed by the distribution means 15. That is, the auxiliary channel demodulating means 19 demodulates the OFDM signal distributed by the distributing means 15 to obtain a signal superimposed TS signal and demodulates the signal superimposed TS signal.

  The identification signal detection means 21 detects and detects the media identification signal and the broadcast station identification ID signal superimposed by the transmission side supervisory control device 1A from the demodulated signal superimposed TS signal by the auxiliary channel demodulation means 19. An alarm signal and a squelch control signal (transmission means shutdown signal) are output when the media identification signal and the broadcast station identification ID signal do not match a preset signal (hereinafter referred to as a local media identification signal). . The identification signal detecting means 21 is provided with an ID classifier (not shown). The ID classifier detects and discriminates a media identification signal and a broadcast station identification ID signal (details will be described later). .

  First, the identification signal detection means 21 detects a media identification signal and a broadcast station identification ID signal from a preset storage area (24 bits in this embodiment) of the auxiliary channel packet. Details of the auxiliary channel packet will be described later (described later with reference to FIG. 12). Subsequently, the identification signal detection means 21 is a signal for which a media identification signal is set in advance, for example, when the setting signal indicates a general television in Tokyo, and the media identification signal indicates a commercial television in another prefecture. If there is, an alarm signal for notifying abnormality detection is output to the outside of the device 3A. The identification signal detection unit 21 outputs a squelch control signal so that the OFDM signal received by the reception unit 17 is not transmitted from the transmission unit 23.

  The transmission means 23 performs reconversion processing on the OFDM signal received by the reception means 17 and subjected to conversion processing, and transmits it to the monitored control device 3A provided in another relay station broadcasting station. .

  According to the monitored control apparatus 3A, the distributing unit 15 distributes the OFDM signal that is a broadcast wave of digital terrestrial broadcasting, and the receiving unit 17 receives the distributed OFDM signal. Subsequently, the auxiliary channel demodulating means 19 demodulates the auxiliary channel included in the signal superimposed TS signal obtained by OFDM demodulating the OFDM signal, and the identification signal detecting means 21 detects the media identification signal and the broadcasting station identification ID signal. If they do not match the preset signal, an alarm signal and a squelch control signal that stops (shuts down) the function of the device 3A are output because an abnormality is detected. Then, when the squelch control signal is not output by the identification signal detection unit 21, the OFDM signal received by the reception unit 17 is transmitted by the transmission unit 23. That is, the broadcast wave (OFDM signal) received by the receiving means 17 is relayed and output. For this reason, the monitored control device 3A determines the affiliation source and control target of the received OFDM signal based on the media identification signal and broadcast station identification ID signal superimposed by effectively using the auxiliary channel on the transmission side. Therefore, without using a communication line, without misidentifying other external noise components and digital waves (OFDM waves) of other stations, these signals can be used for monitoring as well as monitoring from the transmitting side. .

  That is, the transmission path of the auxiliary channel (AC transmission path) is different from the main transmission line that transmits a program by terrestrial digital broadcasting, instead of having a small transmission capacity, and is based on encoding and decoding in the main transmission line. Since there is no delay (up to about 1 second) such as time interleaving and hierarchical synthesis, it can be said that it is suitable for transmission of control and monitoring signals.

(Configuration of monitoring control system [second embodiment])
FIG. 2 shows a block diagram of a second embodiment of the supervisory control system. As shown in FIG. 2, the monitoring control system B includes a monitoring control device 1B and a monitored control device 3B. In addition, the same code | symbol is attached | subjected to the same structure as the structure demonstrated with the monitoring control system A of FIG. 1, and the description is abbreviate | omitted.

[Configuration of Monitoring and Control Device 1B]
The supervisory control device 1B includes an identification signal generating means 5, a TS signal sending means 7, a signal superimposing means 9, an OFDM modulating means 11, and an output means 13. Note that the monitoring control device 1B has substantially the same configuration as the monitoring control device 1A, and a description thereof will be omitted. However, the code is changed from 1A to 1B for convenience. As a matter of course, the monitoring control apparatus 1B can obtain the same effects as the monitoring control apparatus 1A.

[Configuration of Monitored Control Device 3B]
The monitored control device 3B includes a receiving unit 17b, a transmitting unit 23b, a distributing unit 15b, an auxiliary channel demodulating unit 19b, and an identification signal detecting unit 21b. The monitored control device 3B detects an abnormality in the transmission means 23b based on the media identification signal and the broadcast station identification ID signal sent from the transmission-side monitoring control device 1B using the auxiliary channel. The preset signal of the identification signal detection means 21b of the monitored control device 3B is usually an ID signal (own media identification signal) indicating the media of the local station.

  The receiving unit 17b receives an OFDM signal broadcast (output) as a terrestrial digital broadcast wave from the transmission-side monitoring control device 1B, performs a conversion process, and outputs the OFDM signal to the transmitting unit 23b. Unlike the receiving unit 17 of the monitored control device 3A of the monitoring control system A shown in FIG. 1, the receiving unit 17b receives the OFDM signal captured by the receiving antenna directly without using the distributing unit 15.

  The transmission unit 23b performs re-conversion processing on the OFDM signal subjected to the conversion processing by the reception unit 17b to generate an OFDM signal, and transmits the OFDM signal to the monitored control device 3B provided in another relay station broadcasting station. . The transmission means 23b is actually operated as a single transmitter.

  The distribution unit 15b outputs the OFDM signal subjected to the reconversion process by the transmission unit 23b to the auxiliary channel demodulation unit 19b. That is, the distribution unit 15b is arranged at a different position from the distribution unit 15 of the monitored control device 3A of the monitoring control system A shown in FIG. 1, and is provided on the transmission (output) side instead of the OFDM signal reception side. Yes.

  The auxiliary channel demodulating means 19b demodulates the auxiliary channel included in the signal superimposed TS signal obtained by demodulating the OFDM signal that has been reconverted by the transmitting means 23b. That is, the auxiliary channel demodulating means 19b demodulates the OFDM signal distributed by the distributing means 15b to obtain a signal superimposed TS signal and demodulates the signal superimposed TS signal.

  The identification signal detection means 21b determines whether or not the output of the transmission means 23b is normal by detecting the media identification signal and the broadcast station identification ID signal from the auxiliary channel demodulated by the auxiliary channel demodulation means 19b. When the media identification signal and the broadcast station identification ID signal are not detected, an alarm signal is output and the standby system switching is performed to switch to another spare device (not shown) provided in advance at the relay station broadcast station. Output a control signal. In response to the standby system switching control signal, a standby apparatus (not shown) receives the OFDM signal transmitted from the transmitting-side master station broadcast station and relays it to another relay station broadcast station.

  Further, the identification signal detection means 21b detects the media identification signal and the broadcast station identification ID signal from the auxiliary channel demodulated by the auxiliary channel demodulation means 19b, and then the media identification signal and the broadcast station identification ID signal are detected by the local medium identification. Even when the signal does not match, an alarm signal and a standby system switching control signal are output.

  According to the monitored control device 3B, the receiving unit 17b receives an OFDM signal that is a broadcast wave of digital terrestrial broadcasting, and the transmission unit 23b receives the OFDM signal that is the broadcast wave based on the standby system switching control signal. Is sent. Subsequently, the distribution unit 15b distributes the OFDM signal transmitted by the transmission unit 23b, and the auxiliary channel demodulation unit 19b demodulates the auxiliary channel included in the signal superimposed TS signal obtained by OFDM demodulation of the OFDM signal. . The identification signal detection means 21b detects the media identification signal and the broadcast station identification ID signal from the auxiliary channel demodulated by the auxiliary channel demodulation means 19b, and when these do not match the preset signal, the alarm signal is And a standby system switching control signal is output. For this reason, the monitored control device 3B detects the output abnormality of the transmission means 23b based on the media identification signal and the broadcast station identification ID signal superimposed by effectively using the auxiliary channel on the transmission side. Without using a line and without misidentifying other external noise components and digital waves (OFDM waves) of other stations, these signals can be used not only for monitoring but also for control from the transmission side.

(Configuration of monitoring control system [third embodiment])
FIG. 3 shows a block diagram of a third embodiment of the supervisory control system. As shown in FIG. 3, the monitoring control system C includes a monitoring control device 1C and a monitored control device 3C. In addition, the same code | symbol is attached | subjected to the thing same as the structure demonstrated with the monitoring control system A of FIG. 1, FIG. 2, and the description is abbreviate | omitted.

[Configuration of Monitoring and Control Device 1C]
The monitoring control apparatus 1C includes an identification signal generating unit 5, a TS signal transmitting unit 7, a signal superimposing unit 9, an OFDM modulating unit 11, and an output unit 13. Note that the monitoring control apparatus 1C has substantially the same configuration as the monitoring control apparatus 1A, and thus the description thereof is omitted. However, the code is changed from 1A to 1C for convenience. As a matter of course, the monitoring control apparatus 1C can obtain the same effects as the monitoring control apparatus 1A.

[Configuration of Monitored Control Device 3C]
The monitored control device 3C includes a first distribution unit 25, a reception unit 17, a transmission unit 23, a second distribution unit 27, a first auxiliary channel demodulation unit 29, and a second demodulation channel demodulation unit 31. And a signal detection means 21c.

  The first distribution means 25 captures an OFDM signal transmitted as a broadcast wave of terrestrial digital broadcasting from the monitoring control apparatus 1C with an antenna or the like, and the captured OFDM signal is divided into a plurality of systems (usually 2 or 3 systems). To distribute. The OFDM signal distributed by the first distribution unit 25 is input to the reception unit 17 and the first auxiliary channel demodulation unit 29.

  The second distribution unit 27 outputs the OFDM signal subjected to the reconversion process by the transmission unit 23 to the second auxiliary channel demodulation unit 31. That is, the second distribution means 27 is provided on the transmission (output) side of the OFDM signal, similarly to the distribution means 15b of the monitored control device 3B of the monitoring control system B shown in FIG.

  The first auxiliary channel demodulating unit 29 demodulates the auxiliary channel included in the signal superimposed TS signal obtained by demodulating the OFDM signal distributed by the first distributing unit 25. That is, the first auxiliary channel demodulating means 29 demodulates the OFDM signal distributed by the first distributing means 25 to obtain a signal superimposed TS signal and demodulates the signal superimposed TS signal.

  The second demodulating channel demodulating means 31 demodulates the auxiliary channel included in the signal superimposed TS signal obtained by demodulating the OFDM signal subjected to the reconversion processing by the transmitting means 23. That is, the second auxiliary channel demodulating means 31 demodulates the OFDM signal distributed by the second distributing means 27 to acquire a signal superimposed TS signal and demodulates the signal superimposed TS signal.

  The identification signal detection means 21c is included in the signal superimposed TS signal demodulated by the auxiliary channel and the second auxiliary channel demodulation means 31 included in the signal superimposed TS signal demodulated by the first auxiliary channel demodulation means 29. From the auxiliary channel, the media identification signal and the broadcast station identification ID signal superimposed by the monitoring control apparatus 1C on the transmission side are detected, and the detected media identification signal and the broadcast station identification ID signal If they do not match, an alarm signal and a standby system switching control signal are output.

  That is, the identification signal detection means 21c detects the media identification signal and the broadcast station identification ID signal from the auxiliary channel obtained from the OFDM signal on the reception side and the auxiliary channel obtained from the OFDM signal on the transmission side. It is determined (determined) whether the monitored control device 3C itself is operating normally. If it is determined that the monitored control device 3C itself is not operating normally, an alarm signal is output and the relay station broadcast station is provided in advance. A backup system switching control signal for switching to another backup device (not shown) is output. In response to the standby system switching control signal, a standby apparatus (not shown) receives the OFDM signal transmitted from the transmitting-side master station broadcast station and relays it to another relay station broadcast station. In this embodiment, the determination (determination) of whether or not the monitored control device 3C itself is operating normally in the identification signal detection means 21c is determined based on the media identification signal detected from at least one auxiliary channel, the broadcast If the location identification ID signal does not match the local station media identification signal, it is determined (determined) that the monitored control device 3C itself is not operating normally.

  According to the monitored control device 3C, the first distribution unit 25 distributes the OFDM signal that is a broadcast wave of digital terrestrial broadcasting, and the reception unit 17 receives the OFDM signal distributed by the first distribution unit 25. The Subsequently, the first auxiliary channel demodulating unit 29 demodulates the auxiliary channel included in the signal superimposed TS signal obtained by OFDM demodulating the OFDM signal, and the transmitting unit 23 performs the broadcast based on the standby system switching control signal. A wave (OFDM signal) is transmitted. Then, the OFDM signal transmitted by the transmission unit 23 is distributed by the second distribution unit 27, and is included in the signal superimposed TS signal obtained by OFDM demodulation of the distributed OFDM signal by the second auxiliary channel demodulation unit 31. When the auxiliary channel is demodulated, and the identification signal detection means 21 detects a media identification signal and a broadcast station identification ID signal from at least one demodulated auxiliary channel, and these do not coincide with the local media identification signal, an alarm signal Is output, and a standby system switching control signal is output. For this reason, in the monitored control device 3C, the auxiliary channel obtained from the OFDM signal on the reception side and the transmission side on the basis of the media identification signal and the broadcast station identification ID signal superimposed by effectively using the auxiliary channel on the transmission side. Since the media identification signal and the broadcast station identification ID signal are detected from the auxiliary channel obtained from the OFDM signal and it is determined whether or not it matches the local station media identification signal, the abnormality in the monitored control device 3C itself is detected. Can be detected.

(Configuration of monitoring control system [fourth embodiment])
FIG. 4 shows a block diagram of a fourth embodiment of the supervisory control system. As shown in FIG. 4, the monitoring control system D includes a monitoring control device 1D and a monitored control device 3D. In addition, the same code | symbol is attached | subjected to the thing same as the structure demonstrated with the monitoring control system A, B, C of FIGS. 1-3, and the description is abbreviate | omitted.

  In this monitoring control system D, information including a media identification signal and a broadcast station identification ID signal is input from a plurality of media to the monitored control device 3D arranged in the relay station broadcasting station to be controlled, Based on these signals, the monitored control device 3D is monitored and controlled.

[Configuration of Monitoring and Control Device 1D]
The supervisory control device 1D includes an identification signal generating means 5, a control signal input means 33, a TS signal sending means 7, a signal superimposing means 9d, an OFDM modulating means 11, and an output means 13. In addition,

  The control signal input means 33 is for inputting a control signal for controlling the monitored control device 3D of the relay station broadcasting station serving as a control target station by the user of the monitoring control device 1D. Note that a relay station broadcasting station serving as a control target station includes a plurality of media (information propagation means).

  The signal superimposing means 9d inputs the media identification signal and broadcasting station identification ID signal generated by the identification signal generating means 5 and the control signal to the auxiliary channel preset in the TS signal transmitted by the TS signal transmitting means 7. The control signal input by the means 33 is superimposed. That is, the signal superimposing means 9d inserts the media identification signal, the broadcasting station identification ID signal, and the control signal as the additional information into the auxiliary channel for transmitting the additional information.

  According to the monitoring control apparatus 1D, the identification signal generating means 5 generates a media identification signal and a broadcast station identification ID signal, and the control signal input means 33 inputs a control signal. Subsequently, the TS signal sending means 7 sends a TS signal of a terrestrial digital broadcast wave, and the signal superimposing means 9d identifies the auxiliary channel preset by the TS signal sent by the TS signal sending means. The media identification signal generated by the signal generation means 5, the broadcast station identification ID signal, and the control signal input by the control signal input means 33 are superimposed (stored), and the signal superimposed TS signal on which these are superimposed is the OFDM modulation means 11 Thus, OFDM modulation is performed. Then, the output means 13 outputs an OFDM signal obtained by subjecting the signal superimposed TS signal to OFDM modulation by the OFDM modulation means 11 as a broadcast wave of terrestrial digital broadcasting. For this reason, in the broadcast wave of terrestrial digital broadcasting, the media identification signal, the broadcast station identification ID signal, and the control signal are output by effectively using the auxiliary channel. Based on the identification signal and the broadcast station identification ID signal, the affiliation source and control target of the received OFDM signal are determined, and control according to the control signal is performed. Without misidentifying an external noise component or a digital wave (OFDM signal) of another station, it is possible to perform not only monitoring of the apparatus 3D but also control.

[Configuration of Monitored Control Device 3D]
The monitored control device 3D includes a distribution unit 15, a reception unit 17, a transmission unit 23, a first auxiliary channel demodulation unit 29, a second auxiliary channel demodulation unit 31d, and an identification signal detection unit 21d. .

  The second auxiliary channel demodulating means 31d demodulates an auxiliary channel input from a device (not shown) different from the monitored control device 3D. Another device (not shown) refers to another media facility provided in the relay station broadcasting station.

  The identification signal detection means 21d is included in the auxiliary channel included in the signal superimposed TS signal demodulated by the first auxiliary channel demodulation means 29 and the signal superimposed TS signal demodulated by the second auxiliary channel demodulation means 31d. From the auxiliary channel, the media identification signal and the broadcast station identification ID signal superimposed by the monitoring control device 1D on the transmission side are detected, and the detected media identification signal and the broadcast station identification ID signal If they do not match, an alarm signal and a standby system switching control signal are output.

  According to the monitored control device 3D, the distributing unit 15 distributes the OFDM signal that is a broadcast wave of digital terrestrial broadcasting, and the receiving unit 17 receives the OFDM signal distributed by the distributing unit 15. Subsequently, the first auxiliary channel demodulating unit 29 demodulates the auxiliary channel included in the signal superimposed TS signal obtained by OFDM demodulating the OFDM signal, and the second auxiliary channel demodulating unit 31d and the monitored control device 3D. The auxiliary channel included in the signal superimposed TS signal input from another device (not shown) is demodulated. Then, the identification signal detection means 21d generates a media identification signal, a broadcast station identification ID signal, and a control signal from the auxiliary channel demodulated by the first auxiliary channel demodulation means 29 and the auxiliary channel demodulated by the second auxiliary channel demodulation means 31d. When the media identification signal and the broadcast station identification ID signal do not coincide with a preset signal, an alarm signal for notifying abnormality detection, a control signal, and a control for switching to a preliminary device prepared in advance are detected. And a standby system switching control signal for performing. The transmission unit 23 transmits the broadcast wave (OFDM signal) received by the reception unit 17 based on the control signal output from the identification signal detection unit 21d and the standby system switching control signal. For this reason, in the monitored control device 3D, various controls (squelch control or the like) can be performed based on the media identification signal, the broadcast station identification ID signal, and the control signal superimposed by effectively using the auxiliary channel on the transmission side. . In particular, in this monitored control device 3D, if one medium (such as a radio wave) is normal, other external noise components and digital waves (OFDM waves) of other stations are misidentified without using a communication line. In addition, not only monitoring but also control can be performed from the transmission side by a control signal propagated by the medium.

(Configuration of monitoring control system [fifth embodiment])
FIG. 5 shows a block diagram of a fifth embodiment of the supervisory control system. As shown in FIG. 5, the monitoring control system E includes a monitoring control device 1E and a monitored control device 3E. In addition, the same code | symbol is attached | subjected to the same thing as the structure demonstrated by the monitoring control system A, B, C, D of FIGS. 1-4, and the description is abbreviate | omitted.

[Configuration of Monitoring and Control Device 1E]
The supervisory control device 1E includes a control signal input unit 33, a TS signal transmission unit 7e, a signal superimposing unit 9, an OFDM modulation unit 11, and an output unit 13. This monitoring control device 1E is configured by excluding the identification signal generating means 5 from the monitoring control device 1D shown in FIG. 4, and a media identification signal and a broadcast station identification ID signal generated by this identification signal generating means 5 are configured. Is stored as a broadcast wave program in the TS signal sent out by the TS signal sending means 7e.

  The TS signal sending means 7e sends a TS signal including a media identification signal and a broadcast station identification ID signal as a broadcast wave (OFDM signal) program (TS signal broadcast wave program) of terrestrial digital broadcasting.

[Configuration of Monitored Control Device 3E]
The monitored control device 3E includes a distribution unit 15, a reception unit 17, a transmission unit 23, an auxiliary channel demodulation unit 19, an OFDM demodulation unit 35, and an identification signal detection unit 21e.

  The OFDM demodulator 35 demodulates the OFDM signal distributed by the distributor 15 and outputs a broadcast wave program of the TS signal to the identification signal detector. The broadcast wave program for the TS signal is described in XML, similar to the program for the current data broadcast.

  The identification signal detection means 21e detects a control signal from the auxiliary channel included in the signal superimposed TS signal demodulated by the auxiliary channel demodulation means 19, and the detected control signal and the OFDM demodulation means 35 Based on the media identification signal and broadcast station identification ID signal detected from the broadcast wave program, an alarm signal and a standby system switching control signal are output.

  According to the monitored control device 3E, the distributing unit 15 distributes the OFDM signal, which is a broadcast wave of digital terrestrial broadcasting, and the receiving unit 17 receives the OFDM signal distributed by the distributing unit 15. Subsequently, the auxiliary channel demodulating unit 19 demodulates the auxiliary channel included in the signal superimposed TS signal obtained by OFDM demodulating the OFDM signal, and the OFDM demodulating unit 35 demodulates the OFDM signal. Broadcast wave program is output. A control signal is detected from the auxiliary channel demodulated by the auxiliary channel demodulating unit 19 by the identification signal detecting unit 21e, and a media identification signal and a broadcast station identification ID signal are obtained from the broadcast wave program demodulated by the OFDM demodulating unit 35. Is detected, and when at least one of the media identification signal and the broadcast station identification ID signal does not match a preset signal, an alarm signal for notifying abnormality detection and a squelch control for stopping the function of the device Signal is output. Thereafter, when the squelch control signal is not output by the identification signal detection unit 21e, the transmission unit 23 transmits the broadcast wave (OFDM signal) received by the reception unit 17. Therefore, the monitored control device 3E is based on the control signal superimposed by effectively using the auxiliary channel on the transmission side, and the media identification signal and broadcast station identification ID signal stored in the broadcast wave program of the TS signal. Various controls (squelch control, etc.) can be performed, and the control is propagated by the media without using a communication line and misidentifying other external noise components and digital waves (OFDM waves) of other stations. Not only monitoring from the transmission side but also control can be performed by the signal.

(Operation of supervisory control system [first embodiment])
Next, the operation of the monitoring control system A will be described with reference to the sequential chart shown in FIG. 6 (see FIG. 1 as appropriate).
First, the monitoring control apparatus 1A generates a media identification signal and a broadcast station identification ID signal by the identification signal generating means 5 (a1). Subsequently, the supervisory control device 1A sends the TS signal by the TS signal sending means 7 (a2), and the signal superimposing means 9 generates the auxiliary channel preset by the TS signal by the identification signal generating means 5 The medium identification signal and the broadcast station identification ID signal thus superimposed are superimposed on each other to obtain a signal superimposed TS signal (a3).

  Then, the supervisory control apparatus 1A performs OFDM modulation on the signal superimposed TS signal on which the media identification signal and the broadcast station identification ID signal are superimposed by the signal superimposing means 9 by the OFDM modulating means 11 (a4), and by the output means 13 Then, it is transmitted as a broadcast wave (OFDM signal) of terrestrial digital broadcasting (a5).

  Then, the monitored control device 3A distributes the captured terrestrial digital broadcast wave (OFDM signal) by the distributing unit 15 (b1), and receives the OFDM signal distributed by the distributing unit 15 by the receiving unit 17. (B2). Then, the monitored control device 3A demodulates the auxiliary channel included in the signal superimposed TS signal obtained by demodulating the OFDM signal distributed by the distributing unit 15 by the auxiliary channel demodulating unit 19 (b3), and identifies it. The signal detection means 21 detects the media identification signal and the broadcast station identification ID signal from the demodulated auxiliary channel (b4).

  Then, the monitored control device 3A determines whether or not the detected media identification signal and broadcasting station identification ID signal match the local media identification signal by the identification signal detection means 21 (b5). If it is (b5, Yes), the transmission means 23 transmits a broadcast wave (OFDM signal) (b6), and if it does not match (b5, No), a squelch control signal is output to the transmission means 23. At the same time, an alarm signal is output to the outside (b7).

(Operation of supervisory control system [second embodiment])
Next, the operation of the monitoring control system B will be described with reference to the sequential chart shown in FIG. 7 (see FIG. 2 as appropriate).
First, the supervisory control device 1B generates a media identification signal and a broadcast station identification ID signal by the identification signal generating means 5 (a11). Subsequently, the supervisory control device 1B sends the TS signal by the TS signal sending means 7 (a12), and the signal superimposing means 9 generates the auxiliary channel preset by the TS signal by the identification signal generating means 5 The medium identification signal and the broadcast station identification ID signal thus superimposed are superimposed on each other to obtain a signal superimposed TS signal (a13).

  Then, the supervisory control apparatus 1B performs OFDM modulation on the signal superimposed TS signal on which the media identification signal and the broadcast station identification ID signal are superimposed by the signal superimposing means 9 by the OFDM modulating means 11 (a14), and by the output means 13 Then, it is transmitted as a terrestrial digital broadcast wave (OFDM signal) (a15).

  Then, the monitored control device 3B receives the broadcast wave (OFDM signal) of the terrestrial digital broadcast by the receiving unit 17b (b11), performs conversion processing, and outputs it to the transmitting unit 23b. A signal is output (b12). Subsequently, the monitored control device 3B is obtained by distributing (b13) the output OFDM signal by the distributing unit 15b and demodulating the OFDM signal distributed by the distributing unit 15b by the auxiliary channel demodulating unit 19b. The auxiliary channel included in the signal superimposed TS signal is demodulated (b14), and the identification signal detection means 21b detects the media identification signal and the broadcast station identification ID signal from the demodulated auxiliary channel (b15).

  Then, the monitored control device 3B determines whether or not the detected media identification signal and broadcasting station identification ID signal match the local media identification signal by the identification signal detection means 21b (b16). If it is (b16, Yes), the transmission means 23b continuously transmits the broadcast wave (OFDM signal) (b17). If they do not match (b16, No), the transmission means 23 sends a backup system. A switching control signal is output and an alarm signal is output to the outside (b18).

(Operation of supervisory control system [third embodiment])
Next, the operation of the monitoring control system C will be described with reference to the sequential chart shown in FIG. 8 (see FIG. 3 as appropriate).
First, the monitoring control device 1C generates a media identification signal and a broadcast station identification ID signal by the identification signal generating means 5 (a21). Subsequently, the supervisory control apparatus 1C sends the TS signal by the TS signal sending means 7 (a22), and the signal superimposing means 9 generates the auxiliary channel preset by the TS signal by the identification signal generating means 5 The medium identification signal and the broadcast station identification ID signal thus superimposed are superimposed on each other to obtain a signal superimposed TS signal (a23).

  Then, the supervisory control apparatus 1C performs OFDM modulation on the signal superimposed TS signal on which the media identification signal and the broadcast station identification ID signal are superimposed by the signal superimposing means 9 by the OFDM modulating means 11 (a24), and by the output means 13 Then, it is transmitted as a terrestrial digital broadcast wave (OFDM signal) (a25).

  Then, the monitored control device 3C distributes the terrestrial digital broadcast broadcast wave (OFDM signal) by the first distribution unit 25 (b21), and receives the OFDM signal by the reception unit 17 (b22). Subsequently, the monitored control device 3C demodulates the auxiliary channel included in the signal superimposed TS signal obtained by demodulating the OFDM signal distributed by the first distribution unit 25 by the first auxiliary channel demodulation unit 29. (B23) The identification signal detection means 21c detects the media identification signal and the broadcast station identification ID signal from the demodulated auxiliary channel (b24).

  Then, the monitored control device 3C determines whether or not the detected media identification signal and broadcasting station identification ID signal match the local station media identification signal by the identification signal detection means 21c (b25). If it is (b25, Yes), the transmission means 23 transmits a broadcast wave (OFDM signal) (b26). Further, the monitored control device 3C distributes the OFDM signal transmitted from the transmission unit 23 by the second distribution unit 27 (b27), and demodulates the transmitted OFDM signal by the second auxiliary channel demodulation unit 31. The auxiliary channel included in the signal superimposed TS signal obtained in this way is demodulated (b28), and the identification signal detecting means 21c detects the media identification signal and the broadcast station identification ID signal from the demodulated auxiliary channel (b29).

  Then, the monitored control device 3C determines whether the media identification signal and the broadcast station identification ID signal can be detected by the identification signal detection unit 21c (b30), and if it can be detected (b30, Yes), the transmission unit. The broadcast wave (OFDM signal) is continuously transmitted from 23 (b31). In addition, when the media identification signal and the broadcast station identification ID signal do not match with the local station media identification signal at b25 (b25, No), and the media identification signal and the broadcast station identification ID signal cannot be detected at b30. In the case (b30, No), a standby system switching control signal is output to the transmission means 23 and an alarm signal is output to the outside (b32).

(Operation of supervisory control system [fourth embodiment])
Next, the operation of the monitoring control system D will be described with reference to the sequential chart shown in FIG. 9 (see FIG. 4 as appropriate).
First, the monitoring control device 1D generates a media identification signal and a broadcast station identification ID signal by the identification signal generating means 5 (a31). Subsequently, a control signal is input to the monitoring control apparatus 1D via the control signal input means 33 (a32). Then, the supervisory control apparatus 1D sends the TS signal by the TS signal sending means 7 (a33), and the signal superimposing means 9d generates the auxiliary channel preset by the TS signal by the identification signal generating means 5 by the signal superimposing means 9d. The medium identification signal, the broadcast station identification ID signal, and the control signal input via the control signal input means 33 are superimposed to obtain a signal superimposed TS signal (a34).

  Then, the supervisory control apparatus 1D performs OFDM modulation on the signal superimposed TS signal on which the media identification signal, the broadcasting station identification ID signal, and the control signal are superimposed by the signal superimposing unit 9d by the OFDM modulating unit 11 (a35), and outputs it. The means 13 transmits it as a terrestrial digital broadcast wave (OFDM signal) (a36).

  Then, in the monitored control device 3D, the distribution unit 15 distributes the captured terrestrial digital broadcast wave (OFDM signal) (b41), and the reception unit 17 receives the OFDM signal distributed by the distribution unit 15. (B42). Then, the monitored control device 3D demodulates the auxiliary channel included in the signal superimposed TS signal obtained by demodulating the OFDM signal distributed by the distributing unit 15 by the first auxiliary channel demodulating unit 29 (b43). Then, the second auxiliary channel demodulation means 31d demodulates the auxiliary channel included in the signal superimposed TS signal input from another medium (b44).

  Then, the monitored control device 3D detects the media identification signal and the broadcast station identification ID signal from the demodulated auxiliary channel by the identification signal detection means 21d (b45). Then, the monitored control device 3D determines whether or not the detected media identification signal and broadcasting station identification ID signal match the local media identification signal by the identification signal detection means 21d (b46). If it is (b46, Yes), control based on the control signal is performed, and a broadcast wave (OFDM signal) is transmitted (b47). If they do not match (b46, No), the transmission means 23 is reserved. A system switching control signal is output and an alarm signal is output to the outside (b48).

(Operation of supervisory control system [fifth embodiment])
Next, the operation of the monitoring control system E will be described with reference to the sequential chart shown in FIG. 10 (see FIG. 5 as appropriate).
First, a control signal is input to the monitoring control apparatus 1E via the control signal input means 33 (a41). Then, the supervisory control device 1E sends the TS signal by the TS signal sending means 7 (a42), and the signal superimposing means 9 sends the auxiliary channel preset by the TS signal to the auxiliary channel via the control signal input means 33. The input control signal is superimposed to obtain a signal superimposed TS signal (a43).

  Then, the supervisory control apparatus 1E performs OFDM modulation on the signal superimposed TS signal on which the control signal is superimposed by the signal superimposing means 9 by the OFDM modulating means 11 (a44), and the output means 13 broadcasts the terrestrial digital broadcast wave. Transmit as (OFDM signal) (a45).

  Then, in the monitored control device 3E, the distribution unit 15 distributes the captured digital terrestrial broadcast wave (OFDM signal) (b51), and the reception unit 17 receives the OFDM signal distributed by the distribution unit 15. (B52). Then, the monitored control device 3E demodulates the auxiliary channel included in the signal superimposed TS signal obtained by demodulating the OFDM signal distributed by the distributing unit 15 by the auxiliary channel demodulating unit 19 (b53). The demodulation means 35 demodulates the OFDM signal (b54), and outputs a broadcast wave program of the TS signal obtained as a result of the demodulation to the identification signal detection means 21e.

  Then, the monitored control device 3E detects the control signal from the demodulated auxiliary channel by the identification signal detection means 21e, and also detects the media identification signal and the broadcast station identification from the broadcast program of the TS signal output from the OFDM demodulation means 35. An ID signal is detected (b55).

  Then, the monitored control device 3A determines whether or not the detected media identification signal and broadcast station identification ID signal match the local media identification signal by the identification signal detection means 21e (b56). If it is (b56, Yes), control based on the control signal is performed, and the transmission means 23 transmits a broadcast wave (OFDM signal) (b57). If they do not match (b56, No) The squelch control signal is output to the transmission means 23 and an alarm signal is output to the outside (b58).

(About level control by supervisory control system)
Next, level control of the supervisory control system A will be described with reference to FIG.
FIG. 11 is a diagram illustrating level control of a plurality of control target stations using the supervisory control system A. Level control refers to performing monitoring control by specifying the number of control target stations (number of stages) according to a preset level.
FIG. 11A shows level control in the case of level 1. In this case, only the master station broadcasting station that first receives the terrestrial digital broadcast broadcast wave (OFDM signal) transmitted from the monitoring control apparatus 1A. It becomes the target of monitoring control.

  FIG. 11B shows level control in the case of level 2. In this case, a master station broadcasting station that first receives a terrestrial digital broadcast broadcast wave (OFDM signal) transmitted from the monitoring control apparatus 1A, Next, the first-stage relay station broadcast station that has received the broadcast wave (OFDM signal) output from the master station broadcast station is the object of monitoring control.

  FIG. 11 (c) shows level control in the case of level 3. In this case, the master station broadcasting station that first received the digital terrestrial broadcast wave (OFDM signal) transmitted from the monitoring control apparatus 1A, Next, the first-stage relay station broadcast station that received the broadcast wave (OFDM signal) output from the master station broadcast station, and the broadcast wave (OFDM signal) relayed by the first-stage relay station broadcast station were received. The second-stage relay station broadcasting station is a monitoring control target.

  FIG. 11 (d) shows level control in the case of level 4, and in this case, a master station broadcasting station that first received a terrestrial digital broadcast broadcast wave (OFDM signal) transmitted from the monitoring control apparatus 1A, Next, the first-stage relay station broadcast station that received the broadcast wave (OFDM signal) output from the master station broadcast station, and the broadcast wave (OFDM signal) relayed by the first-stage relay station broadcast station were received. The second-stage relay station broadcast station and the third-stage relay station broadcast station that has received the broadcast wave (OFDM signal) relayed by the second-stage relay station broadcast station are subject to monitoring control.

  As shown in FIG. 11, by setting the level on the side of setting the monitoring control of the control target station, the broadcast station of the terrestrial digital broadcast, the relay station broadcast station that receives and relays the broadcast wave of digital terrestrial broadcasting by setting the level The number (stage number) can be arbitrarily set.

(About identification signal and ID classifier)
Next, with reference to FIG. 12, an identification signal (media identification signal, broadcasting station identification ID signal) and an ID identifier for identifying the identification signal will be described.
FIG. 12 illustrates the ID classifiers provided in the identification signal detection units 21 to 21d of the monitored control devices 3A to 3D (excluding 3E). In the monitored control device 3E, illustration is omitted.

  As shown in FIG. 12, the ID discriminator receives the demodulation output (24 bits) of the auxiliary channel (AC) as an input, detects an abnormality in the ID, controls from a performance place (master station), or outputs an abnormality in the ID. Alternatively, it outputs various signals indicating switching control (contact or logic output) to the standby system, and includes an ID decoder, a decoder, and an ID designation (16 bits).

  The breakdown of the demodulation output (24 bits) of the auxiliary channel (AC) secures a data amount of 16 bits for ID use and 8 bits for control use.

  The ID decoder compares and determines the demodulated output (24 bits) and a predetermined identification number, and outputs various signals indicating ID detection or control from a performance place (master station broadcasting station). . The ID decoder also sends back signals to a performance place (master station broadcast station) or outputs 24-bit data without passing through a local PC decoder located at a relay broadcast station.

The decoder receives the output of the ID decoder and outputs various signals indicating ID abnormal output or switching control (contact or logic output) to the standby system.
The ID designation (16 bits) holds signals (media identification signal, broadcast station identification ID signal) set in advance for each monitored control device 3A to 3E.

  As shown in FIG. 12, in the example of ID abnormality detection by the ID discriminator, for example, when there is a mismatch, the 16 bits of ID use are “0000 0000 0000 0001”. The bit becomes “0110 1010 0011 1011”. If they do not match, various signals indicating abnormal output of ID or switching control to the standby system (contact or logic output) will be output.

(About auxiliary channels)
Next, the auxiliary channel will be described with reference to FIG.
FIG. 13 illustrates the data structure of an auxiliary channel (AC) packet (AC packet). As shown in FIG. 13, the auxiliary channel (AC) has a differential reference (1 bit) and a configuration identification (ARB STD-B31, which is a standard of the Radio Industries Association (ARIB). 3 bits), service identification (4 bits), packet number (9 bits), maximum packet number identification (1 bit), ID signal (24 bits), and parity (82 bits). In this embodiment, the data structure of the auxiliary channel (AC) packet (AC packet) uses “Configuration 2” defined by ARIB STD-B31.

  The auxiliary channel (AC) is “ID-1 (4 bits)”, “ID-2 (4 bits)”, “ID-3 (4 bits), which is 24 bits from the beginning of the data portion of the auxiliary channel. "ID-4 (4 bits)" stores a media identification signal and a broadcast station identification ID signal, and "Control (8 bits)" stores a control signal.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment. For example, in the present embodiment, the monitoring control devices 1A to 1E and the monitored control devices 3A to 3E are described, but the processing of each configuration of each of the devices 1A to 1E and 3A to 3E is a process of one by one. It can also be regarded as a monitored control method and a monitored control method. The processing of each component of each of the devices 1A to 1E and 3A to 3E can be regarded as a monitoring control program and a monitored control program described in a general-purpose computer language. In these cases, the same effects as those of the devices 1A to 1E and 3A to 3E can be obtained.

1 is a block diagram of a monitoring control system according to a first embodiment. It is a block diagram of the supervisory control system concerning a second embodiment. It is a block diagram of a supervisory control system concerning a third embodiment. It is a block diagram of the supervisory control system which concerns on 4th embodiment. It is a block diagram of the supervisory control system concerning a fifth embodiment. It is a sequential chart explaining operation | movement of the monitoring control system shown in FIG. It is a sequential chart explaining operation | movement of the monitoring control system shown in FIG. It is a sequential chart explaining operation | movement of the monitoring control system shown in FIG. It is a sequential chart explaining operation | movement of the monitoring control system shown in FIG. 6 is a sequential chart explaining the operation of the monitoring control system shown in FIG. 5. It is a figure explaining level control of a supervisory control system. It is a figure explaining the identification signal and ID discriminator. It is the figure explaining the data structure of the packet of an auxiliary channel. It is a block diagram of the conventional squelch detection apparatus. It is a figure explaining a digital wave.

Explanation of symbols

1A to 1E Monitoring and control devices 3A to 3E Monitored control devices 5 Identification signal generating means 7 TS signal sending means 9 Signal superimposing means 11 OFDM modulation means 13 Output means 15 Distribution means 17 Receiving means 19 Auxiliary channel demodulation means 21 Identification signal detecting means 21 23 transmission means 25 first distribution means 27 second distribution means 29 first auxiliary channel demodulation means 31 second auxiliary channel demodulation means 33 control signal input means 35 OFDM demodulation means

Claims (8)

The auxiliary channel in terrestrial digital broadcasting, media identification signals identifying the release transmitting belongs source, superimposes a broadcast plant identification ID signal identifying the master station broadcasting stations or relay stations broadcast stations to be controlled by the broadcast wave If the media identification signal or the broadcast station identification ID signal detected at the master station broadcast station or the relay station broadcast station does not match a preset signal, an alarm signal and a squelch A supervisory control device capable of outputting a control signal or a standby system switching control signal ,
Identification signal generating means for generating the media identification signal and the broadcast station identification ID signal;
TS signal sending means for sending a TS signal of the broadcast wave of the terrestrial digital broadcast;
Signal superimposing means for superimposing the media identification signal generated by the identification signal generating means and the broadcast station identification ID signal on the auxiliary channel set in advance by the TS signal transmitted by the TS signal transmitting means;
OFDM modulation means for performing OFDM modulation on the signal superimposed TS signal in which the media identification signal and the broadcasting station identification ID signal are superimposed on the auxiliary channel by the signal superimposing means;
An output means for outputting an OFDM signal obtained by performing OFDM modulation on the signal superimposed TS signal by the OFDM modulation means, as a broadcast wave of the terrestrial digital broadcast;
A monitoring control device comprising: A ground signal having a TS signal in which a medium identification signal for identifying a broadcast wave affiliation source and a broadcast station identification ID signal for identifying a master station or relay station broadcast station to be controlled by the broadcast wave are stored as a program Detected from the program at the master station broadcast station or relay station broadcast station by superimposing and transmitting a control signal for controlling the broadcasting device provided at the master station broadcast station or relay station broadcast station on the auxiliary channel in digital broadcasting When either the media identification signal or the broadcast station identification ID signal does not match a preset signal, an alarm signal and a squelch control signal can be output, and if both match, the control signal A monitoring and control device that enables control based on
Control signal input means for inputting the control signal;
A TS signal sending means for sending the pre-Symbol T S signal,
Signal superimposing means for superimposing the control signal input by the control signal input means on the auxiliary channel set in advance by the TS signal transmitted by the TS signal transmitting means;
OFDM modulation means for performing OFDM modulation on the signal superimposed TS signal in which the control signal is superimposed on the auxiliary channel by the signal superimposing means;
An output means for outputting an OFDM signal obtained by performing OFDM modulation on the signal superimposed TS signal by the OFDM modulation means, as a broadcast wave of the terrestrial digital broadcast;
A monitoring control device comprising: The auxiliary channel in terrestrial digital broadcasting, media identification signals identifying the release transmitting belongs source Transmitting Station identification ID signal identifying the master station broadcasting stations or relay stations broadcast stations to be controlled by the broadcast wave, the The media identification signal and the broadcast station identification detected at the master station broadcast station or the relay station broadcast station by superimposing and sending out a control signal for controlling the broadcast device provided in the master station broadcast station or the relay station broadcast station. When any of the ID signals does not match a preset signal, an alarm signal and a standby system switching control signal can be output, and when both match, control based on the control signal is enabled. A monitoring and control device,
Identification signal generating means for generating the media identification signal and the broadcast station identification ID signal;
Control signal input means for inputting the control signal;
TS signal sending means for sending a TS signal of the broadcast wave of the terrestrial digital broadcast;
The auxiliary channel preset by the TS signal sent by the TS signal sending means is inputted by the media identification signal generated by the identification signal generating means, the broadcast station identification ID signal, and the control signal input means. Signal superimposing means for superimposing the control signal;
OFDM modulation means for performing OFDM modulation on the signal superimposed TS signal on which the media identification signal, the broadcast station identification ID signal and the control signal are superimposed by the signal superimposing means;
An output means for outputting an OFDM signal obtained by performing OFDM modulation on the signal superimposed TS signal by the OFDM modulation means, as a broadcast wave of the terrestrial digital broadcast;
A monitoring control device comprising: At least a media identification signal that identifies the affiliation of the broadcast wave superimposed on the auxiliary channel in terrestrial digital broadcasting, and a broadcast station identification that identifies the master station or relay station broadcaster that is controlled by the broadcast wave A monitored control device that is monitored and controlled by an ID signal,
Distribution means for distributing an OFDM signal which is a broadcast wave of the terrestrial digital broadcast;
Receiving means for receiving the OFDM signal distributed by the distributing means;
Auxiliary channel demodulating means for demodulating the auxiliary channel included in the signal superimposed TS signal obtained by OFDM demodulating the OFDM signal distributed by the distributing means;
The media identification signal and the broadcast station identification ID signal are detected from the auxiliary channel demodulated by the auxiliary channel demodulation means, and it is determined whether the media identification signal and the broadcast station identification ID signal match a preset signal. And an identification signal detection means for outputting an alarm signal for notifying abnormality detection and a squelch control signal for stopping the function of the device when they do not match,
When the identification signal detection means does not output the squelch control signal, the transmission means for transmitting the OFDM signal received by the reception means,
A monitored control apparatus comprising: At least a media identification signal that identifies the affiliation of the broadcast wave superimposed on the auxiliary channel in terrestrial digital broadcasting, and a broadcast station identification that identifies the master station or relay station broadcaster that is controlled by the broadcast wave A monitored control device that is monitored and controlled by an ID signal,
Receiving means for receiving an OFDM signal which is a broadcast wave of the terrestrial digital broadcast;
Transmitting means for transmitting the OFDM signal received by the receiving means;
Distributing means for distributing the OFDM signal transmitted by the transmitting means;
Auxiliary channel demodulating means for demodulating the auxiliary channel included in the signal superimposed TS signal obtained by OFDM demodulation of the OFDM signal distributed by the distributing means;
The media identification signal and the broadcast station identification ID signal are detected from the auxiliary channel demodulated by the auxiliary channel demodulation means, and it is determined whether the media identification signal and the broadcast station identification ID signal match a preset signal. And an identification signal detecting means for outputting a standby system switching control signal to the transmission means for outputting an alarm signal for notifying abnormality detection and causing control to switch to a standby apparatus prepared in advance if they do not match. ,
The monitored control apparatus, wherein the transmission means transmits the OFDM signal received by the reception means in accordance with the presence / absence of the standby system switching control signal. At least a media identification signal that identifies the affiliation of the broadcast wave superimposed on the auxiliary channel in terrestrial digital broadcasting, and a broadcast station identification that identifies the master station or relay station broadcaster that is controlled by the broadcast wave A monitored control device that is monitored and controlled by an ID signal,
First distribution means for distributing an OFDM signal which is a broadcast wave of the terrestrial digital broadcast;
Receiving means for receiving the OFDM signal distributed by the first distributing means;
First auxiliary channel demodulating means for demodulating the auxiliary channel included in the signal superimposed TS signal obtained by OFDM demodulating the OFDM signal distributed by the first distributing means;
Transmitting means for transmitting the OFDM signal received by the receiving means;
Second distribution means for distributing the OFDM signal transmitted by the transmission means;
Second auxiliary channel demodulating means for demodulating the auxiliary channel included in the signal superimposed TS signal obtained by OFDM demodulating the OFDM signal distributed by the second distributing means;
The media identification signal and the broadcast station identification ID signal are detected from at least one of the auxiliary channel demodulated by the first auxiliary channel demodulation unit and the auxiliary channel demodulated by the second auxiliary channel demodulation unit, and the media identification is performed. It is determined whether the signal and the broadcast station identification ID signal match a preset signal, and if the media identification signal does not match, or the broadcast station identification ID signal does not match, an alarm for notifying abnormality detection An identification signal detection means for outputting a transmission system to a standby system switching control signal for outputting a signal and performing a control to switch to a standby apparatus prepared in advance;
The monitored control apparatus, wherein the transmission means transmits the OFDM signal received by the reception means in accordance with the presence / absence of the standby system switching control signal. Media identification signal that identifies at least the broadcast wave affiliation source multiplexed to the auxiliary channel in terrestrial digital broadcasting, and broadcast station identification that identifies the master station or relay station broadcaster that is controlled by the broadcast wave A monitored control device that is monitored and controlled by an ID signal and a control signal that controls a broadcasting device provided in the master station broadcasting station or the relay station broadcasting station,
Distribution means for distributing an OFDM signal which is a broadcast wave of the terrestrial digital broadcast;
Receiving means for receiving the OFDM signal distributed by the distributing means;
Auxiliary channel demodulating means for demodulating the auxiliary channel included in the signal superimposed TS signal obtained by OFDM demodulating the OFDM signal distributed by the distributing means;
The media identification signal, the broadcast station identification ID signal, and the control signal are detected from the auxiliary channel demodulated by the auxiliary channel demodulation means and the auxiliary channel input from a device different from the monitored control device, and It is determined whether the media identification signal and the broadcast station identification ID signal match a preset signal, and if the media identification signal does not match or the broadcast station identification ID signal does not match, an abnormality detection is notified. Identification signal detecting means for outputting an alarm signal to be performed, and a backup system switching control signal for performing control to switch to the control signal and a standby device prepared in advance;
Based on the control signal output from the identification signal detection means and the standby system switching control signal, transmission means for transmitting the OFDM signal received by the reception means,
A monitored control apparatus comprising: Monitored control that is supervised and controlled by a control signal that is multiplexed with an auxiliary channel in digital terrestrial broadcasting and that controls at least a broadcasting device provided in a master station or relay station that is controlled by a broadcast wave. A device,
Distribution means for distributing an OFDM signal which is a broadcast wave of the terrestrial digital broadcast;
Receiving means for receiving the OFDM signal distributed by the distributing means;
Auxiliary channel demodulating means for demodulating the auxiliary channel included in the signal superimposed TS signal obtained by OFDM demodulating the OFDM signal distributed by the distributing means;
OFDM demodulation means for OFDM-demodulating the OFDM signal distributed by the distribution means to obtain the signal superimposed TS signal;
Media identification for detecting the control signal from the auxiliary channel demodulated by the auxiliary channel demodulating means and identifying the affiliation source of the broadcast wave included in the signal superimposed TS signal demodulated by the OFDM demodulating means A broadcast station identification ID signal for identifying a signal, a master station broadcast station or a relay station broadcast station to be controlled by the broadcast wave, and at least one of the media identification signal and the broadcast station identification ID signal is An identification signal detecting means for determining whether or not the signal matches a preset signal, and outputting an alarm signal for notifying abnormality detection and a squelch control signal for stopping the function of the device if they do not match;
When the identification signal detection means does not output the squelch control signal, the transmission means for transmitting the OFDM signal received by the reception means,
A monitored control apparatus comprising:

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